WITH is said "ile" (or LE or LA or YLE or YLA)
*It's a word that you can write separately:
ex: annem ile (with my mum),
which belongs to the formal and mainly written language,
*or as en ending:
ex: annemle (with my mum),
which belongs to the informal language and is both written and spoken. (to be preferred)
*As for all endings, apply the vowel harmony rule:
after a ı o u add la / after e i ö ü add le